Note 9 - Regulatory Matters - Capital Amounts and Ratios (Details) $ in Thousands	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Tier 1 (Core) Capital to average total assets Bank, actual amount	$ 101,962	$ 57,520
Tier 1 (Core) Capital to average total assets Bank, actual ratio	0.0993	0.0967
Tier 1 (Core) Capital to average total assets Bank, to be well capitalized amount	$ 92,449	$ 53,531
Tier 1 (Core) Capital to average total assets Bank, to be well capitalized ratio	0.09	0.09

Amount of total capital as defined by regulatory framework.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

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Amount of minimum total risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

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